Natural Compound

Guarana Seed

Paullinia cupana

Evidence TierBWADA NOT PROHIBITED

tuneTypical Dose

75-150 mg per day (whole extract)

watchEffect Window

Acute onset 45-60 minutes, duration about 4-8 hours.

check_circleCompliance

WADA NOT PROHIBITED

Overview

Clinical Summary

Guarana seed (Paullinia cupana) is a natural caffeine source with additional polyphenols. It is used to increase alertness and reduce fatigue, often in energy-focused formulations.

Human studies show improved alertness and attention, largely attributable to caffeine, with some evidence of improved mood. It may support endurance performance and perceived energy. Minority benefits include antioxidant effects from polyphenols and small metabolic changes, but evidence is limited. Side effects mirror caffeine, including anxiety and sleep disruption at higher doses or late timing.

Guarana seed (whole extract) improves alertness and fatigue resistance via adenosine antagonism and central arousal pathways, with an acute sweet-spot at 75 mg.

Outcomes

What This Is Expected To Influence

Primary Outcomes

  • Cognitive performance
  • Alertness
  • Stamina

Secondary Outcomes

  • Fatigue relief

Safety

Contraindications and Interactions

Contraindications

  • Severe untreated hypertension
  • Active severe anxiety disorder
  • Pregnancy
  • Lactation
  • Unstable cardiovascular disease

Side effects

  • Jitteriness
  • Nervousness
  • Insomnia
  • Tachycardia
  • GI discomfort

Interactions

  • Stimulants
  • CYP1A2-interacting agents

Avoid if

  • Active arrhythmia
  • Severe uncontrolled hypertension
  • Severe anxiety
  • High-risk stimulant stacks

Evidence

Study-level References

guarana-seed-SRC-KENN-2004Double-blind crossover trial
Sourceopen_in_new

Kennedy 2004, double-blind crossover trial

Population: Adults

Dose protocol: Acute whole-extract dosing with 75 mg sweet-spot condition

Key findings: 75 mg whole extract demonstrated favorable alertness/cognitive effects, with evidence supporting a practical acute sweet-spot signal against comparator dosing arms.

Notes: Evidence is promising but still limited in sample size and breadth. Focus use on short-term, user-logged response with periodic reassessment.

Paper content

75 mg whole extract demonstrated favorable alertness/cognitive effects, with evidence supporting a practical acute sweet-spot signal against comparator dosing arms.

guarana-seed-SRC-HACK-2023Systematic review and meta-analysis.
Sourceopen_in_new

Hack B, Penna EM, Talik T, Chandrashekhar R, Millard-Stafford M. Effect of Guarana (Paullinia cupana) on Cognitive Performance: A Systematic Review and Meta-Analysis. Nutrients. 2023;15(2):434. doi:10.3390/nu15020434. PMID:36678305.

Population: 328 participants across eight placebo-controlled studies of acute guarana ingestion.

Dose protocol: Acute guarana 37.5 to 500 mg across eight placebo-controlled studies

Key findings: Overall cognitive effects negligible. Small improvement in response time, particularly with liquid delivery format.

Notes: Meta-analysis provides context for the modest scope of guarana's cognitive benefits beyond the Kennedy 2004 single-study signal.

Paper content

This systematic review and meta-analysis pooled eight placebo-controlled studies (n=328) examining acute guarana ingestion on cognitive performance. Overall cognitive effects were negligible, but subgroup analysis found a small improvement in response time, particularly when guarana was dissolved in liquid rather than taken as capsules. Accuracy measures were not significantly affected. The findings suggest that any cognitive benefit of guarana is modest and may be partially format dependent, though the evidence base remains small.

guarana-seed-SRC-ESTR-2024Randomized, crossover, placebo-controlled trial.
Sourceopen_in_new

Estrázulas JA, Santos PC, Machado AF, Legnani E, Bertuzzi R, Lima-Silva AE. Effects of Acute Ingestion of Guarana (Paullinia Cupana) on Soccer Player Performance: A Randomized, Cross-over, Placebo-Controlled Study. J Am Nutr Assoc. 2024. doi:10.1080/27697061.2024.2373189. PMID:38958672.

Population: 27 under-17 male soccer players from a professional club.

Dose protocol: Single 3 g guarana seed powder dose, tested 60 minutes post-ingestion

Key findings: Improved intermittent endurance (YYIR1 distance) in young soccer players. No sprint, jump, or agility benefit.

Notes: Adds an exercise-performance dimension. Endurance-type benefit is consistent with caffeine-driven mechanisms.

Paper content

This crossover RCT tested a single 3 g dose of guarana seed powder in 27 young male soccer players. Guarana improved intermittent endurance (YYIR1 distance) compared with placebo, but did not improve countermovement jump, sprint, or agility outcomes. The finding supports a modest endurance-type benefit from acute guarana ingestion in young athletes, likely related to caffeine content plus potential non-caffeine constituents. The lack of sprint and power benefits suggests the mechanism operates more through sustained effort capacity than explosive output.

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